import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '@/components/Login'
import Home from '@/components/Home'

Vue.use(VueRouter)

const routes = [
  { path: '/', redirect: '/login' },
  { path: '/login', component: Login },
  { path: '/home', component: Home }
]
const router = new VueRouter({
  routes
})

//挂载路由导航守卫
router.beforeEach((to, from, next) => {
  //to将要访问的路径
  //from 代表从哪个路径跳转过来
  // next是一个函数，表示放行
  // next（）放行 next（'/login'）强制跳转
  if(to.path === '/login') return next();
  //获取token
  const tokenStr = window.sessionStorage.getItem('token');
  if(!tokenStr) {
    return next('/login')
  }
  next();//放行
})

export default router
